multi: update more loggers to the v2 type

lnrpc/watchtowerrpc/log.go

@@ -1,7 +1,7 @@
 package watchtowerrpc
 
 import (
-	"github.com/btcsuite/btclog"
+	"github.com/btcsuite/btclog/v2"
 	"github.com/lightningnetwork/lnd/build"
 )
 

lnrpc/websocket_proxy.go

@@ -12,7 +12,7 @@ import (
 	"strings"
 	"time"
 
-	"github.com/btcsuite/btclog"
+	"github.com/btcsuite/btclog/v2"
 	"github.com/gorilla/websocket"
 	"golang.org/x/net/context"
 )

lnrpc/wtclientrpc/config.go

@@ -1,7 +1,7 @@
 package wtclientrpc
 
 import (
-	"github.com/btcsuite/btclog"
+	"github.com/btcsuite/btclog/v2"
 	"github.com/lightningnetwork/lnd/lncfg"
 	"github.com/lightningnetwork/lnd/watchtower/wtclient"
 )